Great, simple, idea. An etch-a-sketch hooked up to an old mouse with a couple of stepper motors, wired through RS232 connectors, a couple of couplers (I love saying that), and a nothing-fancy Atmel Mega 32.
Imagine the possibilities this could hold? Actually being able to draw a circle on an etch-a-sketch! We should build this and marry it up with Bre’s code for printing images of of people and we can have an etch-a-sketch Portrait Maker 3000! Here’s the link to the schematic, the code and the instructions.